/*
 * Song Library — a dense, keyboard-first browser that sits inside the Piano
 * Tool console. It borrows the app's system type, dark surface ladder, and
 * restrained active-control treatment; catalog behavior stays in the overlay.
 */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.song-library-modal {
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: clamp(12px, 2vw, 28px);
    background: rgba(0, 0, 0, 0.78);
    backdrop-filter: blur(var(--glass-blur));
}

.song-library-modal.visible {
    display: flex !important;
}

.song-library-credits-link {
    position: fixed;
    right: 12px;
    bottom: 8px;
    z-index: 10;
    color: var(--text-3);
    font: 10px var(--font-system);
}

.song-library-modal__content {
    position: relative;
    width: min(1260px, 100%);
    max-width: none;
    max-height: min(860px, calc(100vh - 32px));
    margin: 0;
    padding: 0;
    overflow: hidden;
    color: var(--text-1);
    background: linear-gradient(180deg, #17191e 0%, #101216 100%);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.58);
}

.song-library-modal__header {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 4;
    display: block;
    margin: 0;
}

.song-library-modal__close {
    display: grid;
    width: 32px;
    height: 32px;
    padding: 0;
    color: var(--text-2);
    font-size: 22px;
    font-weight: 400;
    line-height: 1;
    place-items: center;
    background: var(--surface-2);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    transition: color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}

.song-library-modal__close:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--border-strong);
}

.song-library-modal__close:focus-visible,
.song-library-browser button:focus-visible,
.song-library-browser input:focus-visible,
.song-library-browser select:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.song-library-modal .song-list {
    display: block;
    max-height: min(860px, calc(100vh - 32px));
    overflow: auto;
}

.song-library-browser {
    position: relative;
    z-index: 1;
    padding: clamp(20px, 2.5vw, 32px);
}

.song-library-intro {
    display: flex;
    gap: var(--space-4);
    align-items: flex-end;
    justify-content: space-between;
    padding: 0 44px 20px 0;
    border-bottom: 1px solid var(--border-default);
}

.song-library-intro__copy {
    max-width: 720px;
}

.song-library-kicker,
.song-library-rail__eyebrow,
.song-library-filter-label {
    margin: 0;
    color: var(--text-3);
    font-family: var(--font-mono);
    font-size: var(--font-xs);
    font-weight: 700;
    letter-spacing: 0.13em;
    line-height: 1.3;
    text-transform: uppercase;
}

.song-library-title {
    max-width: 670px;
    margin: 5px 0 6px;
    color: var(--text-1);
    font-family: var(--font-system);
    font-size: clamp(22px, 2.1vw, 30px);
    font-weight: 650;
    letter-spacing: -0.02em;
    line-height: 1.12;
}

.song-library-subtitle,
.song-library-browse__subtitle,
.song-library-rail__note {
    margin: 0;
    color: var(--text-2);
    font-size: 13px;
    line-height: 1.5;
}

.song-library-count {
    display: grid;
    min-width: 108px;
    gap: 2px;
    padding: 8px 0 4px 16px;
    border-left: 1px solid var(--border-default);
}

.song-library-count strong {
    color: var(--text-1);
    font-family: var(--font-system);
    font-size: 26px;
    font-weight: 650;
    line-height: 1;
}

.song-library-count span {
    max-width: 88px;
    color: var(--text-3);
    font-size: 10px;
    line-height: 1.35;
}

.song-library-layout {
    display: grid;
    grid-template-columns: minmax(198px, 0.24fr) minmax(0, 0.76fr);
    gap: clamp(20px, 3vw, 36px);
    margin-top: 20px;
}

.song-library-rail {
    align-self: start;
    padding: 0 18px 0 0;
    border-right: 1px solid var(--border-default);
}

.song-library-rail__title {
    margin: 4px 0 12px;
    color: var(--text-1);
    font-family: var(--font-system);
    font-size: 15px;
    font-weight: 650;
    letter-spacing: -0.01em;
}

.song-library-path {
    display: flex;
    width: 100%;
    min-height: 40px;
    gap: 8px;
    align-items: center;
    justify-content: space-between;
    padding: 8px;
    color: var(--text-2);
    font: inherit;
    text-align: left;
    cursor: pointer;
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    transition: color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}

.song-library-path:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.055);
}

.song-library-path.is-active {
    color: var(--text-1);
    background: var(--accent-bg-soft);
    border-color: rgba(56, 145, 255, 0.55);
}

.song-library-path--all {
    margin-bottom: 6px;
    font-weight: 650;
}

.song-library-path__label {
    display: grid;
    min-width: 0;
    gap: 2px;
}

.song-library-path__label strong {
    overflow: hidden;
    font-size: 12px;
    font-weight: 650;
    line-height: 1.2;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.song-library-path__label small {
    overflow: hidden;
    color: var(--text-3);
    font-size: 10px;
    line-height: 1.2;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.song-library-path.is-active .song-library-path__label small {
    color: var(--text-2);
}

.song-library-path__count {
    flex: 0 0 auto;
    min-width: 20px;
    padding: 2px 6px;
    color: var(--text-3);
    font-size: 10px;
    font-variant-numeric: tabular-nums;
    text-align: center;
    background: var(--surface-2);
    border-radius: var(--radius-sm);
}

.song-library-path.is-active .song-library-path__count {
    color: var(--text-1);
    background: rgba(0, 0, 0, 0.24);
}

.song-library-rail__note {
    margin-top: 16px;
    padding: 12px 8px 0;
    border-top: 1px solid var(--border-subtle);
    font-size: 11px;
}

.song-library-browse {
    min-width: 0;
}

.song-library-browse__header {
    display: flex;
    gap: 12px;
    align-items: end;
    justify-content: space-between;
}

.song-library-browse__title {
    margin: 3px 0 3px;
    color: var(--text-1);
    font-family: var(--font-system);
    font-size: 18px;
    font-weight: 650;
    letter-spacing: -0.015em;
}

.song-library-browse__subtitle {
    max-width: 430px;
    font-size: 12px;
}

.song-library-search {
    display: flex;
    flex: 0 1 270px;
    min-width: 200px;
    height: var(--control-h-md);
    gap: 6px;
    align-items: center;
    padding: 0 9px;
    background: var(--surface-3);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    transition: border-color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}

.song-library-search:focus-within {
    background: rgba(0, 0, 0, 0.5);
    border-color: var(--accent);
}

.song-library-search__icon {
    color: var(--text-3);
    font-family: var(--font-system);
    font-size: 16px;
    line-height: 1;
    transform: rotate(-18deg);
}

.song-library-search input {
    width: 100%;
    min-width: 0;
    padding: 0;
    color: var(--text-1);
    font: 12px var(--font-system);
    background: transparent;
    border: 0;
    outline: 0;
}

.song-library-search input::placeholder {
    color: var(--text-3);
}

.song-library-level-row,
.song-library-focus-row {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    margin-top: 14px;
}

.song-library-filter-label {
    flex: 0 0 38px;
    padding-top: 8px;
}

.song-library-level-controls,
.song-library-focus-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
}

.song-library-level,
.song-library-focus,
.song-library-clear,
.song-library-empty__action {
    min-height: var(--control-h-sm);
    padding: 4px 8px;
    color: var(--text-2);
    font: 11px var(--font-system);
    cursor: pointer;
    background: var(--surface-2);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    transition: color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}

.song-library-level:hover,
.song-library-focus:hover,
.song-library-clear:hover,
.song-library-empty__action:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.09);
    border-color: var(--border-strong);
}

.song-library-level.is-active,
.song-library-focus.is-active {
    color: var(--text-1);
    background: var(--accent-bg-soft);
    border-color: var(--accent);
}

.song-library-filter-count {
    margin-left: 4px;
    color: var(--text-3);
    font-variant-numeric: tabular-nums;
}

.song-library-focus-row {
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border-subtle);
}

.song-library-focus {
    min-height: 23px;
    padding: 3px 7px;
    font-size: 10px;
}

.song-library-fine-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 10px;
}

.song-library-select {
    display: flex;
    min-width: 120px;
    gap: 5px;
    align-items: center;
    padding: 0 5px 0 8px;
    color: var(--text-3);
    font-size: 10px;
    background: var(--surface-3);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
}

.song-library-select select {
    min-width: 0;
    height: 28px;
    color: var(--text-2);
    font: 10px var(--font-system);
    cursor: pointer;
    background: transparent;
    border: 0;
    outline: 0;
}

.song-library-select option {
    color: var(--text-1);
    background: #15171b;
}

.song-library-results__header {
    display: flex;
    min-height: 28px;
    align-items: center;
    justify-content: space-between;
    margin-top: 14px;
}

.song-library-results__count {
    margin: 0;
    color: var(--text-3);
    font-size: 11px;
}

.song-library-clear {
    min-height: 24px;
    padding: 3px 0;
    color: var(--accent);
    background: transparent;
    border: 0;
    border-radius: 0;
}

.song-library-clear:hover {
    color: var(--accent-hover);
    background: transparent;
    border-color: transparent;
}

.song-library-piece-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    margin-top: 7px;
}

.song-library-piece-card {
    display: flex;
    min-width: 0;
    flex-direction: column;
}

.song-library-piece-card[hidden] {
    display: none;
}

.song-library-piece {
    position: relative;
    display: flex;
    width: 100%;
    min-height: 174px;
    flex: 1;
    padding: 13px;
    overflow: hidden;
    flex-direction: column;
    color: inherit;
    font: inherit;
    text-align: left;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.035);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    box-shadow: none;
    transition: border-color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}

.song-library-piece:hover {
    background: rgba(255, 255, 255, 0.07);
    border-color: var(--border-strong);
    transform: none;
    box-shadow: none;
}

.song-library-piece__top,
.song-library-piece__meta,
.song-library-piece__focuses {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    align-items: center;
}

.song-library-piece__top {
    justify-content: space-between;
    margin-bottom: 10px;
}

.song-library-piece__level,
.song-library-piece__duration {
    color: var(--text-2);
    font-family: var(--font-mono);
    font-size: 9px;
    font-weight: 600;
    letter-spacing: 0.07em;
    text-transform: uppercase;
}

.song-library-piece__duration {
    color: var(--text-3);
    font-family: var(--font-mono);
    font-weight: 500;
    letter-spacing: 0;
}

.song-library-piece__title {
    position: relative;
    z-index: 1;
    overflow: hidden;
    margin-bottom: 3px;
    color: var(--text-1);
    font-family: var(--font-system);
    font-size: 15px;
    font-weight: 650;
    letter-spacing: -0.01em;
    line-height: 1.25;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.song-library-piece__composer {
    overflow: hidden;
    color: var(--text-2);
    font-size: var(--font-sm);
    text-overflow: ellipsis;
    white-space: nowrap;
}

.song-library-piece__practice {
    min-height: 32px;
    margin: 9px 0 8px;
    color: var(--text-2);
    font-size: 11px;
    font-style: normal;
    line-height: 1.45;
}

.song-library-piece__meta {
    gap: 0;
    color: var(--text-3);
    font-size: 10px;
}

.song-library-piece__meta span + span::before {
    margin: 0 6px;
    color: rgba(255, 255, 255, 0.22);
    content: '•';
}

.song-library-piece__focuses {
    margin-top: 8px;
}

.song-library-piece__focuses span {
    padding: 3px 5px;
    color: var(--text-2);
    font-size: 9px;
    line-height: 1.2;
    background: var(--surface-2);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
}

.song-library-piece__credit {
    display: block;
    margin: 6px 2px 0;
    color: var(--text-3);
    font-size: 9px;
    line-height: 1.35;
    text-align: left;
}

.song-library-piece__source,
.song-library-piece__license {
    color: var(--text-2);
    font-weight: 650;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.song-library-piece__source:hover,
.song-library-piece__source:focus-visible,
.song-library-piece__license:hover,
.song-library-piece__license:focus-visible {
    color: var(--accent-hover);
}

.song-library-piece__action {
    margin-top: auto;
    padding-top: 10px;
    color: var(--text-2);
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.song-library-piece:hover .song-library-piece__action {
    color: var(--accent-hover);
}

.song-library-empty {
    grid-column: 1 / -1;
    padding: 34px;
    text-align: center;
    background: var(--surface-2);
    border: 1px dashed var(--border-default);
    border-radius: var(--radius-md);
}

.song-library-empty h4 {
    margin: 0 0 6px;
    color: var(--text-1);
    font-family: var(--font-system);
    font-size: 16px;
    font-weight: 650;
}

.song-library-empty p {
    max-width: 420px;
    margin: 0 auto;
    color: var(--text-2);
    font-size: 12px;
    line-height: 1.5;
}

.song-library-empty__action {
    margin-top: 16px;
    color: var(--text-1);
    background: var(--accent-bg-soft);
    border-color: var(--accent);
}

@media (max-width: 900px) {
    .song-library-modal {
        align-items: flex-start;
        padding: 12px;
    }

    .song-library-modal__content,
    .song-library-modal .song-list {
        max-height: calc(100vh - 24px);
    }

    .song-library-browser {
        padding: 25px;
    }

    .song-library-layout {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .song-library-rail {
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 6px;
        padding: 0 0 19px;
        border-right: 0;
        border-bottom: 1px solid var(--border-default);
    }

    .song-library-rail__eyebrow,
    .song-library-rail__title,
    .song-library-rail__note {
        grid-column: 1 / -1;
    }

    .song-library-rail__title {
        margin-bottom: 4px;
    }

    .song-library-path--all {
        margin-bottom: 0;
    }

    .song-library-rail__note {
        display: none;
    }
}

@media (max-width: 640px) {
    .song-library-modal {
        padding: 0;
    }

    .song-library-modal__content,
    .song-library-modal .song-list {
        max-height: 100vh;
        border-radius: 0;
    }

    .song-library-browser {
        padding: 24px 17px 32px;
    }

    .song-library-intro {
        display: block;
        padding-right: 34px;
        padding-bottom: 21px;
    }

    .song-library-title {
        font-size: 28px;
    }

    .song-library-count {
        display: flex;
        min-width: 0;
        gap: 8px;
        align-items: baseline;
        padding: 14px 0 0;
        border-top: 1px solid var(--border-subtle);
        border-left: 0;
    }

    .song-library-count strong {
        font-size: 24px;
    }

    .song-library-count span {
        max-width: none;
    }

    .song-library-rail {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .song-library-path {
        min-height: 51px;
    }

    .song-library-browse__header {
        display: block;
    }

    .song-library-search {
        max-width: none;
        margin-top: 15px;
    }

    .song-library-level-row,
    .song-library-focus-row {
        display: block;
    }

    .song-library-filter-label {
        display: block;
        padding: 0 0 7px;
    }

    .song-library-piece-grid {
        grid-template-columns: 1fr;
    }

    .song-library-piece {
        min-height: 194px;
    }

    .song-library-select {
        flex: 1 1 142px;
    }
}